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Current diagnostic approaches including skin prick tests and whole nut-specific serum IgE tests. The guideline also recommends a new type of test, which is based on reactions to specific proteins within nuts. This new test currently applies only to peanut allergies, but work is being done to identify two hazelnut proteins.

The new guideline seeks to add context to decision making and give practical help to healthcare professionals, enabling them to identify and prioritise those patients most in need of diagnosis and support. New and updated areas covered by the guideline also include:

identifying high-risk groups of patients (e.g. young children with severe eczema or an egg allergy) and assessing siblings